//
// Copyright 2019 Bloomberg Finance L.P.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

import Foundation

public protocol Printer {
    func text(_ message: String)

    func error(_ message: String)
}

public protocol FileSystem {
    func listCurrentDirectory() throws -> [String]
}

class DefaultPrinter: Printer {
    func text(_ message: String) {
        print(message)
    }

    func error(_ message: String) {
        print("ERROR: \(message)")
    }
}

class DefaultFileSystem: FileSystem {
    func listCurrentDirectory() throws -> [String] {
        let fileManager = FileManager.default
        let contents = try fileManager.contentsOfDirectory(atPath: fileManager.currentDirectoryPath)
        return contents.map { fileManager.currentDirectoryPath.appending("/\($0)") }
    }
}
